Matter is conserved


Energy flows, but matter is recycled



Importance of biogeochemical cycling

Cycling = Transfer, transformation and storage


Biogeochemical cycles: Global

Nutrient cycles: Ecosystem
- Entry of nutrients into system (IN)
- fixation (bacteria)
- weathering (rocks)
- deposition (acid rain)
- Internal transfer (recycling)
- Loss of nutrients from system (OUT)

Carbon cycle: Ecosystems


Carbon cycle: Global



Nitrogen cycle: Ecosystems


Nitrogen cycle: Ecosystems


Decomposition

Decomposition rate: Biomes

Nutrient transfer: Soil commmunity

Nitrogen cycle: Global


Primary productivity: Generation of biomass


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